powerpc/rtas: dispatch partition migration requests to pseries

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sys_rtas() cannot call ibm,suspend-me directly in the same way it
handles other inputs. Instead it must dispatch the request to code
that can first perform the H_JOIN sequence before any call to
ibm,suspend-me can succeed. Over time kernel/rtas.c has accreted a fair
amount of platform-specific code to implement this.

Since a different, more robust implementation of the suspend sequence
is now in the pseries platform code, we want to dispatch the request
there.

Note that invoking ibm,suspend-me via the RTAS syscall is all but
deprecated; this change preserves ABI compatibility for old programs
while providing to them the benefit of the new partition suspend
implementation. This is a behavior change in that the kernel performs
the device tree update and firmware activation before returning, but
experimentation indicates this is tolerated fine by legacy user space.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207215200.1785968-16-nathanl@linux.ibm.com

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Nathan Lynch 2020-12-07 15:51:47 -06:00 • committed by Michael Ellerman

parent aeca35b9a5

commit 4d756894ba

3 changed files with 11 additions and 1 deletions

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5

arch/powerpc/include/asm/rtas.h

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2

arch/powerpc/kernel/rtas.c

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5

arch/powerpc/platforms/pseries/mobility.c

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